2-Phase Synchronous Step-Down Controller
Description
LTC3827
Low IQ, Dual, 2-Phase Synchronous Step-Down Controller
FEATURES
DESCRIPTION
n Wide Output Voltage Range: 0.
8V ≤ VOUT ≤ 10V n Low Operating IQ: 80μA (One Channel On) n Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise n OPTI-LOOP® Compensation Minimizes COUT n ±1% Output Voltage Accuracy n Wide VIN Range: 4V to 36V Operation n Phase-Lockable Fixed Frequency 140kHz to 650kHz n Selectable Continuous, Pulse Skipping or Low Ripple
Burst Mode® Operation at Light Loads n Dual N-Channel MOSFET Synchronous Drive n Very Low Dropout Operation: 99% Duty Cycle n Adjustable Output Voltage Soft-Start or Tracking n Output Current Foldback Limiting n Power Good Output Voltage Monitor n Output Overvoltage Protection n Low Shutdown IQ: 8μA n Internal LDO Powers Gate Drive from VIN or VOUT n Small 5mm × 5mm QFN Package
APPLICATIONS
n Automotive Systems n Battery-Operated Digital Devices n Distributed DC Power Systems
The LTC®3827 is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages.
A constant frequency current mode architecture allows a phase-lockable frequency of up to 650kHz.
Power loss and noise due to the ESR of the input capacitor ESR are minimized by operating the two controller output stages out of phase.
The 80μA no-load quiescent current extends operating life in battery-powered systems.
OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values.
The LTC3827 features a precision 0.
8V reference and a power good output indicator.
A wide 4V to 36V input supply range encompasses all battery chemistries.
Independent TRACK/SS pins for each controller ramp the output voltage during start-up.
Current foldback limits MOSFET heat dissipation during short-circuit conditions.
The PLLIN/MODE pin selects among Burst Mode operation, pulse skipping mode, or continuous inductor current mode at light loads...
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